linux-kernel - Re: [RESEND PATCH] drm/panel: otm8009a: Set backlight parent to panel device

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Message-ID: <661a2ac6-adfe-dec9-5b7b-b006f2f31a90@linaro.org>
Date:   Mon, 17 Apr 2023 09:40:19 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     James Cowgill <james.cowgill@...ize.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Philippe CORNU <philippe.cornu@...com>,
        Thierry Reding <treding@...dia.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] drm/panel: otm8009a: Set backlight parent to panel
 device

On 12/04/2023 19:35, James Cowgill wrote:
> This is the logical place to put the backlight device, and it also
> fixes a kernel crash if the MIPI host is removed. Previously the
> backlight device would be unregistered twice when this happened - once
> as a child of the MIPI host through `mipi_dsi_host_unregister`, and
> once when the panel device is destroyed.
> 
> Fixes: 12a6cbd4f3f1 ("drm/panel: otm8009a: Use new backlight API")
> Signed-off-by: James Cowgill <james.cowgill@...ize.com>
> Cc: stable@...r.kernel.org
> ---
>   drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> index b4729a94c34a8..898b892f11439 100644
> --- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> +++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> @@ -471,7 +471,7 @@ static int otm8009a_probe(struct mipi_dsi_device *dsi)
>   		       DRM_MODE_CONNECTOR_DSI);
>   
>   	ctx->bl_dev = devm_backlight_device_register(dev, dev_name(dev),
> -						     dsi->host->dev, ctx,
> +						     dev, ctx,
>   						     &otm8009a_backlight_ops,
>   						     NULL);
>   	if (IS_ERR(ctx->bl_dev)) {

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>